Question regarding Windsor Ontario built cars (70 Swinger)
hope these help... The black is probably part of the phosphate dip process.
http://www.mmcdetroit.com/ICCA/References/Chassis/
http://www.hamtramck-historical.com...DataBook/1967/67_Plymouth_Engineering0031.jpg
http://www.hamtramck-historical.com/images/dealerships/DealershipDataBook/1970/70_Dart0025.jpg
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